FPCN39 CWLW 021435
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT THURSDAY 2 OCTOBER 1997 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      12   13     450   1     94   16    2000   9
KAMLOOPS     KEL      44   14     850   8    100   17    2100  12
OKANAGAN     KEL      11   12     500   1    100   17    2050  12
CASTLEGAR    SPOK    100   13    1550  28    100   16    2400  28
CRANBROOK    SPOK    100   13    2550  30    100   15    2800  31
REVELSTOKE   KEL       9   10     450   1     10   12     550   1

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  15   W   35   W   67
CRANBROOK             W   24   W   63

           INVERSION HT    BREAKTHRU TEMP
KELOWNA          600 m         13 C
SPOKANE          800 m          9 C

TODAY'S VENTING: Good.


VENTING FOR FRIDAY: GOOD


VENTING OUTLOOK SATURDAY THRU MONDAY: Generally good.


CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.     99   10    1400  37    100   13    2250  35
PR. GEORGE   P.G.     69   11    1050  23    100   13    1550  34
SMITHERS     P.G.      9    6     500   0     59   12    1500   5
WELLS GRAY   P.G.    100   13    2650  34    100   15    4000  33
FT NLSN      F.N.     30    2     650   9     47    4     900   9
FT STJOHN    F.N.     73    6    1600  10     97   10    2300  10

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   56   W   65
SMITHERS              W   43   W   65

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      800 m           12 C
FT. NELSON      n/a             n/a

TODAY'S VENTING: Good west of the Rockies. Fair to poor east.


VENTING FOR FRIDAY: Good.


VENTING OUTLOOK SATURDAY THRU MONDAY: Generally good.



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100   15     750  39    100   17    1100  40
FRASER VLY   QUIL    100   15     750  39    100   18    1350  39
SRN VRISL    QUIL     94   15     600  26    100   18    1250  35
CNTRL VRISL  QUIL     19   13     100  14    100   16     800  33
NRN VRISL    HRDY     49   13     550   9     79   15    1050  11
TERRACE      ANT       9    7     200   8     63   10     950  10
STEWART      ANT      14   10     250   2     55   10     800   8

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  39   SW  54   W   61
PORT HARDY   SW  26   W   35   W   43
SANDSPIT     W   31   W   33   W   39

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       150 m         13 C
PORT HARDY       100 m         12 C
ANNETTE          150 m          9 C

TODAY'S VENTING: GOOD.


VENTING FOR FRIDAY: GOOD


VENTING OUTLOOK SATURDAY THRU MONDAY: Generally good.




VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


END/GF